I am having a hard time getting both sides of the tire to seat. I threw 50+ psi at it and only one side seats completely. I'm mounting on a 8.5 inch rim. Any suggestions? I think I have done everything but throw the kitchen sink at it.

I have a "homemade" tire band (sheet metal tube, ratchet straps), which helped in mounting the other 3 tires. I was a bit concerned about pushing the 60 psi limit. I guess I just needed some reassurance that I can hit it with 80 psi. My poor little compressor won't get the tire up to 80, but I will bring it to a buddy's house and have him use his big one on it this week. Thanks for the feedback!

Thanks for all of the advice. For once Tim Allen's more power theory didn't turn around and bite me! Looks as though I just needed a bigger compressor (and a little courage). Took out the valve core and pumped it up to 75 psi before both sides popped! Used my homemade ring and had zero issues. This rookie dad can rest a little easier knowing I have tackled one more obstacle in this gigantic learning curve. Man is there a lot I hadn't accounted for. So far its been enjoyable though. Thanks again.